A Toradol (ketorolac) shot typically provides pain relief for about 4 to 6 hours, with some people experiencing residual effects for up to 8 hours. You can expect to start feeling relief within 30 minutes of the injection, with peak effects hitting around 1 to 2 hours after the shot. It’s one of the strongest anti-inflammatory medications available by injection, and for acute back pain, it often works as well as opioid painkillers.
How Quickly It Works and How Long Relief Lasts
Toradol is given as an intramuscular injection, usually in the upper arm, thigh, or buttock. Most people notice the pain starting to ease within 20 to 30 minutes. The drug reaches its full strength in your bloodstream roughly 1 to 2 hours after injection, and that’s when you’ll feel the most relief.
The active pain-relieving window runs about 4 to 6 hours for most people. After that, the effect gradually tapers. Some people report lingering improvement beyond 6 hours, but the core window of strong relief is within that range. If your back pain is still significant after the shot wears off, your provider may give additional doses every 6 hours, though this is kept to a short course.
How It Compares to Opioid Pain Relief
Toradol is not an opioid. It works by blocking the enzymes (COX-1 and COX-2) that produce prostaglandins, the chemicals your body releases at the site of injury or inflammation that amplify pain signals. For back pain driven by muscle spasm or inflammation, this direct anti-inflammatory action can be more effective than a narcotic painkiller, which only masks pain without addressing the underlying swelling.
Clinical trials comparing ketorolac injections to morphine injections for acute pain have shown comparable pain score reductions. In one study of 88 patients, pain scores at 5, 30, and 60 minutes after injection showed no significant difference between the two drugs. In another trial of 148 patients, ketorolac actually performed better during movement, with a 50% greater likelihood of pain reduction when patients were active rather than at rest. That’s a meaningful advantage for back pain, since the whole point is being able to move comfortably again. Toradol also carries none of the sedation, nausea, or dependency risk that comes with opioids.
The Five-Day Limit
Toradol carries a strict maximum treatment window of 5 days total, whether you’re receiving injections, oral tablets, or a combination of both. This isn’t a soft suggestion. The FDA placed a boxed warning on the drug after post-marketing data showed that treatment beyond 5 days more than doubled the rate of serious gastrointestinal bleeding compared to opioids. For clinically significant bleeds, the risk was nearly three times higher.
The good news: when treatment is kept under 5 days at standard doses in adults under 65, the risk of GI bleeding and surgical-site bleeding is no higher than with other pain medications. The risk climbs with higher doses, longer treatment, and older age. This is why Toradol is designed as a short-term bridge to get you through the worst of an acute back pain episode, not as an ongoing treatment.
What Happens After the Shot Wears Off
If your back pain is severe enough to warrant a Toradol shot, you’ll likely need a plan for the hours and days that follow. Some providers will transition you to oral ketorolac tablets taken every 4 to 6 hours, but that still counts toward the 5-day total. Others will switch you to over-the-counter anti-inflammatories like ibuprofen or naproxen, which work through a similar mechanism but are gentler on the stomach and kidneys at standard doses.
You should not take aspirin, ibuprofen, naproxen, or any other NSAID at the same time as ketorolac. Stacking these drugs increases the risk of stomach bleeding and kidney problems without providing additional pain relief. Increasing the dose of ketorolac beyond what’s prescribed also doesn’t improve its effectiveness, it only raises the chance of side effects.
Who Should Not Get a Toradol Shot
Toradol is off-limits for several groups of people. You should not receive it if you have:
- Active or recent stomach ulcers or GI bleeding
- Kidney disease or dehydration, since ketorolac can cause acute kidney failure in vulnerable patients
- A history of asthma or allergic reactions triggered by aspirin or NSAIDs
- Bleeding disorders or conditions requiring blood thinners, because ketorolac inhibits platelet function
- Current use of aspirin or another NSAID
It’s also not appropriate during pregnancy (particularly labor and delivery), before major surgery, or after coronary artery bypass grafting. If you fall into any of these categories, your provider will choose a different approach for your back pain.
What to Realistically Expect
A single Toradol shot can take the edge off a severe back pain flare for several hours, and for many people that window of relief is enough to break the cycle of muscle guarding and spasm that keeps acute back pain going. It’s especially useful when over-the-counter options haven’t been strong enough and you want to avoid opioids.
That said, it’s a short-term tool. If your back pain returns after the shot wears off and persists beyond a few days, that’s a signal to look deeper at the cause rather than seeking repeated injections. Toradol treats the inflammation and pain, not the structural or mechanical issue behind it. Most acute low back pain episodes improve substantially within a few weeks regardless of treatment, but persistent or worsening symptoms warrant further evaluation.